The ice bucket challenge has warmed – or frozen – the hearts of millions around the world.
Its purpose, like many similar social media crazes such as the no make-up selfie, was to raise money and awareness for ALS, which supports people with motor neurone disease.
The challenge has been undertaken by local residents, councillors, MPs and even well-known celebrities such as actor Will Smith and Windows founder Bill Gates (left).
However, like all things, the challenge has come in for criticism from some.
While the ice bucket challenge raises money for ALS, there are also other more simple and cheaper ways to donate to charities in need that people overlook, such as donating clothes or blood.
On top of this, many have pointed out the millions of gallons of water that have been wasted so that people can take part in the challenge, while people in more unfortunate parts of the world suffer from dehydration.
According to one media study, only 42 per cent of people who take the challenge actually donate to ALS.